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The microflora of ripening barley grain and the effects of pre harvest fungicide application
Author(s) -
HILL R. A.,
LACEY J.
Publication year - 1983
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1983.tb02717.x
Subject(s) - biology , benomyl , cladosporium , fungicide , alternaria alternata , alternaria , trichoderma harzianum , horticulture , anthesis , botany , agronomy , penicillium , biological pest control , cultivar
SUMMARY Newly‐emerged ears of barley soon became colonised by micro‐organisms with numbers increasing to 5·8 × 10 5 viable propagules/g dry weight by harvest. Bacteria were numerically predominant throughout. Yeasts and yeast‐like fungi were also numerous during the early stages of grain development but were exceeded by propagules of filamentous fungi during ripening, with Cladosporium spp., Alternaria alternata, Epicoccum purpurascens and Verticillium lecanii most abundant. Numbers of most micro‐organisms were greatest in a wet season but Alternaria was equally abundant in hot dry weather. Application of fungicides at or after anthesis modified the grain microflora. Captafol was most effective overall in decreasing numbers of fungi. However, benomyl decreased Cladosporium inoculum more than catpafol but was ineffective against Alternaria which became more numerous on benomyl‐treated grain than on untreated. Yield increases of up to 4% were obtained by late fungicide treatment, least in a hot, dry year. Germination was also increased by some treatments by up to 5%.

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